Ingredients in Tetrasterone™: List of scientific studies

Eurycomanone, the major quassinoid in Eurycoma longifolia root extract increases spermatogenesis by inhibiting the activity of phosphodiesterase and aromatase in steroidogenesis. http://www.ncbi.nlm.nih.gov/pubmed/23810842

Eurycoma longifolia as a potential alternative to testosterone for the treatment of osteoporosis: Exploring time-mannered proliferative, differentiative and morphogenic modulation in osteoblasts. https://www.ncbi.nlm.nih.gov/pubmed/27818256

Males with low serum levels of vitamin D have lower pregnancy rates when ovulation induction and timed intercourse are used as a treatment for infertile couples: results from a pilot study. http://www.ncbi.nlm.nih.gov/pubmed/26589555